Pressure vessel

Abstract

A pressure vessel for fluid includes a plurality of main body portions, each having a tubular shape extending along a first direction and disposed along a second direction orthogonal to the first direction, and one or more bent portions, each having a tubular shape, extending between two adjacent end portions of the main body portions, and connecting the main body portions in series. A cross-sectional shape of the bent portion perpendicular to an extension direction is a shape in which a dimension in a third direction orthogonal to the first direction and the second direction is larger than a dimension in a fourth direction orthogonal to the third direction.

What is claimed is: 
     
         1 . A pressure vessel for fluid, the pressure vessel comprising:
 a plurality of main body portions, each having a tubular shape extending along a first direction and disposed along a second direction orthogonal to the first direction; and   one or more bent portions, each having a tubular shape, extending between two adjacent end portions of the main body portions, and connecting the main body portions in series, wherein   a cross-sectional shape of the bent portion perpendicular to an extension direction is a shape in which a dimension in a third direction orthogonal to the first direction and the second direction is larger than a dimension in a fourth direction orthogonal to the third direction.   
     
     
         2 . The pressure vessel according to  claim 1 , wherein the cross-sectional shape is oval or elliptical. 
     
     
         3 . The pressure vessel according to  claim 1 , wherein the cross-sectional shape is rectangular. 
     
     
         4 . A pressure vessel for fluid, the pressure vessel comprising:
 a plurality of main body portions, each having a tubular shape extending along a first direction and disposed along a second direction orthogonal to the first direction; and   one or more bent portions, each having a tubular shape, extending between two adjacent end portions of the main body portions, and connecting the main body portions in series, wherein   a cross-sectional shape of the bent portion perpendicular to an extension direction is a square shape in which a dimension in a third direction orthogonal to the first direction and the second direction is equal to a dimension in a fourth direction orthogonal to the third direction.